Gas. For hydrogen to become a liquid, you need to cool it down to 20.28 K, which is -252.87 degrees Celcius, or -434.45 degrees Fahrenheit if that is more your style. 6 people found this useful.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  voice, sound, vocalize, vocalise(verb) utter with vibrating vocal chords. 2  vocalize, vocalise(verb) sing (each note a scale or in a melody) with the same vowel. 3  vocalize, vocalise, vowelize, vowelise(verb) pronounce as a vowel.
Vocal music is music performed by one or more singers, which are typically called songs, and which may be performed with or without instrumental accompaniment, in which singing provides the main focus of the piece. Vocal music is probably the oldest form of music since it does not require any instrument or equipment besides the voice.